VisualComplexity is hypnotic.  Someone told me recently about an idea relating the complexity of output/expression to the number of rules that generated the output.  Maybe there's an ideal proportional relationship between rules and complex output.

From the author of the site:

Complexity is a challenge by itself. Complex Networks are everywhere. It is a structural and organizational principle that reaches almost every field we can think of, from genes to power systems, from food webs to market shares. Paraphrasing Albert Barabasi, one of the leading researchers in this area, “the mistery of life begins with the intricate web of interactions, integrating the millions of molecules within each organism”. Humans, since their birth, experience the effect of networks every day, from large complex systems like transportation routes and communication networks, to less conscious interactions, common in social networks.

Each of these visualizations makes us say, "Gee, how interesting."  But is it possible to claim authoritatively that one complex network is "better" than another?  What makes a complex network great?  Are there proportionality rules?  Or are all complex networks equally interesting?